1 /* $NetBSD: arm_platform.c,v 1.6 2023/02/25 08:19:35 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * This is the default Arm FDT platform implementation. It assumes the 31 * following: 32 * 33 * - Generic timer 34 * - PSCI support 35 * - Console UART is pre-configured by firmware 36 */ 37 38 #include "opt_console.h" 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: arm_platform.c,v 1.6 2023/02/25 08:19:35 skrll Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/bus.h> 45 #include <sys/cpu.h> 46 #include <sys/device.h> 47 #include <sys/termios.h> 48 49 #include <dev/fdt/fdtvar.h> 50 #include <arm/fdt/arm_fdtvar.h> 51 52 #include <uvm/uvm_extern.h> 53 54 #include <machine/bootconfig.h> 55 56 #include <arm/cpufunc.h> 57 58 #include <arm/cortex/gtmr_var.h> 59 60 #include <arm/arm/psci.h> 61 #include <arm/fdt/psci_fdtvar.h> 62 63 #include <evbarm/dev/plcomreg.h> 64 #include <evbarm/dev/plcomvar.h> 65 66 #include <libfdt.h> 67 68 #include <arch/evbarm/fdt/platform.h> 69 70 extern struct arm32_bus_dma_tag arm_generic_dma_tag; 71 extern struct bus_space arm_generic_bs_tag; 72 73 void plcom_platform_early_putchar(char); 74 75 #define ARM_PTOV(p) (((p) - DEVMAP_ALIGN(uart_base)) + KERNEL_IO_VBASE) 76 77 void __noasan 78 plcom_platform_early_putchar(char c) 79 { 80 #ifdef CONSADDR 81 bus_addr_t uart_base = CONSADDR; 82 83 volatile uint32_t *uartaddr = cpu_earlydevice_va_p() ? 84 (volatile uint32_t *)ARM_PTOV(uart_base): 85 (volatile uint32_t *)uart_base; 86 87 while ((le32toh(uartaddr[PL01XCOM_FR / 4]) & PL01X_FR_TXFF) != 0) 88 continue; 89 90 uartaddr[PL01XCOM_DR / 4] = htole32(c); 91 dsb(sy); 92 93 while ((le32toh(uartaddr[PL01XCOM_FR / 4]) & PL01X_FR_TXFE) == 0) 94 continue; 95 #endif 96 } 97 98 static void 99 arm_platform_init_attach_args(struct fdt_attach_args *faa) 100 { 101 faa->faa_bst = &arm_generic_bs_tag; 102 faa->faa_dmat = &arm_generic_dma_tag; 103 } 104 105 static void 106 arm_platform_device_register(device_t self, void *aux) 107 { 108 } 109 110 static const struct pmap_devmap * 111 arm_platform_devmap(void) 112 { 113 static const struct pmap_devmap devmap_empty[] = { 114 DEVMAP_ENTRY_END 115 }; 116 static struct pmap_devmap devmap_uart[] = { 117 DEVMAP_ENTRY(KERNEL_IO_VBASE, 0, PAGE_SIZE), 118 DEVMAP_ENTRY_END 119 }; 120 121 const int phandle = fdtbus_get_stdout_phandle(); 122 if (phandle <= 0) 123 return devmap_empty; 124 125 bus_addr_t uart_base; 126 if (fdtbus_get_reg(phandle, 0, &uart_base, NULL) != 0) 127 return devmap_empty; 128 129 devmap_uart[0].pd_pa = DEVMAP_ALIGN(uart_base); 130 131 return devmap_uart; 132 } 133 134 static u_int 135 arm_platform_uart_freq(void) 136 { 137 return 0; 138 } 139 140 static const struct arm_platform arm_platform = { 141 .ap_devmap = arm_platform_devmap, 142 .ap_bootstrap = arm_fdt_cpu_bootstrap, 143 .ap_init_attach_args = arm_platform_init_attach_args, 144 .ap_device_register = arm_platform_device_register, 145 .ap_reset = psci_fdt_reset, 146 .ap_delay = gtmr_delay, 147 .ap_uart_freq = arm_platform_uart_freq, 148 .ap_mpstart = arm_fdt_cpu_mpstart, 149 }; 150 151 ARM_PLATFORM(arm, ARM_PLATFORM_DEFAULT, &arm_platform); 152